What factors stimulate mammary glands to produce milk?

Explanation

**Step-by-Step Solution:**

1. **Understanding Mammary Glands**: Mammary glands are specialized organs in mammals that are responsible for producing milk. This process is crucial for nourishing infants after birth.

2. **Role of Hormones**: The production of milk is primarily regulated by hormones. Two key hormones involved in this process are progesterone and prolactin.

3. **Progesterone During Pregnancy**: During pregnancy, the hormone progesterone plays a significant role. It helps in the development and maturation of the mammary glands, preparing them for milk production.

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